Cut-off arrangement for steam-valves



`IULIUS HORNIG, OF NEXVARK, lNEWV JERSEY.

CUT-OFF ARRANGEMENT FOR STEAM-VALVES.

Specification of Letters Patent No. 26,186, dated November 22, 1859.

To all 'whom 'it may concern:

Be it known that I, JULiUs IvIoRNiG, of Newark, in the county of Essex and State of New Jersey, have invented a new and useful Improvement in Cut-Off Gears for Steam-Engines; and I do hereby declare thatthe following is a full, clear, and exact descript-ion of the same, reference being had to the accompanying drawing, forming part of this specification, in which- Figure 1, exhibits a view of a cut-off valve and cut-off gear partly in section, the plane of section being vertical and perpendicular to the axis of the shaft which cairies the cut-off cam. Fig. 2, exhibits a vertical section of the cut-oft' gear in a plane at right angles to Fig. 1. Fig. 3, exhibits a side View of the revolving and swinging cam which constitutes the principal feature of my invention.

Similar letters of reference indicate corresponding parts in t-he several figures.

IvIy invention consists in the employment for opening and controlling the closing of the cut-off valve of a cam constructed applied and operating in the peculiar and very simple manner hereinafter described, whereby I ani enabled to effect the cutting off of the steam variably under the control of a governor or at any given point in the stroke of the piston under the control of suitable means of adjustment.

To enable others skilled in the art to make and use my invention I will proceed to describe its construction and operation.

A, (Fig. 1,) is the valve which may be one of the main induction valves of the engine or a valve used as a mere cut-off in connection with any kind of induction and eduction valve or valves.

B, (Figs. 1, and 2,) is the shaft which carries the cut-off cam, such shaft being either the main shaft of the engine or a separate one deriving a constant rotary motion from such shaft.

C, (Figs. 1, 2, and 3,) is the cut-off cani, consisting of an arc formed piece beveled at each end as shown at a, and and having at one end a a lug c, extending beyeond the bevel a, to receive wrist pin (Z, which serves to attach the said cam to a wrist plate D, which is fast upon the shaft B. The arc of the cam is nearly half a circle. At some distance from the end which is attached to the wrist plate, the said cam has secured to it a pin e, which is fitted with an antifriction roller f, which is received in a groove g, h,

y', in a disk Fi, which is fitted loosely to the shaft B, at such distance from the wrist plate or ai'in D, as to leave just room enough for the cam C, to work between the said disk and the said wrist plate or arm. The said groove is composed of two concentric arc formed portions h, and j, united by two gradually curved portions g, and z'. The larger arc formed portion L, of the said groove is described with such radii that while the antifriction roller f, is carried through it by the revolution of the cam with the wrist plate C, the disk E, being stationary or nearly so, the outer face 7c, of the said cam, is concentric to the shaft B, as shown in black outline in Fig. 1.

F, is a lever which is arranged upon a iixed fulcruin Z, in such a manner that it may be operated upon by the cam, in the revolution of the latter with the wrist plate, rst to lift the valve A, and then to control its descent to its seat.

G, is a rod attached to the disk E, by a pin m, for the purpose of connecting it with a governor or for the purpose of shifting it by hand.

I will commence describing the operation of my cut-off gear by supposing the disk E, to be stationary. The wrist plate D, rotates and carries with it the cam C, in the direction of the arrow shown on the cam in Fig. 1. While the roller j", is in the larger arc formed portion l1. of the groove and the face 7c, of the cam is concentric to the shaft, the front beveled portion a, of the cam comes into operation upon the lever E, and lifts the valve from its seat, and the valve is afterward held open by the action of the face k, of the cam till the roller f, passes into the part of the groove and the cam is caused to swing toward the shaft as shown in red outline in Fig. 1, and so to permit the end of the lever on which it bears to rise gradually, yet quickly and thus lower the valve into its seat. The valve remains closed till the roller f, has passed around into the part It, of the groove again and the end ci, of the cam comes again into operation on the lever when it is opened as before. The cutting 01T is made to take place earlier or later by moving the disk E, around the shaft in one direction or the other. By turning the said disk in the direction of the What I claim as my invention and desire to secure by Letters Patent, is-

The employment for opening and controlling tbe closing of the cut-off valve, of a' revolvlng and swinging cam C, applied in combination With and operated by a revolving Wrist plate D, or its equivalent and a grooved disk E, substantially as herein described.

JULIUS HORNIG. Witnesses:

MICH. HUGHES, C. M. HUGHES. 

